Most of the societies we collect from are able to forward royalties from the past couple of years (generally 1-2 years). While we are able to collect retroactive royalties sometimes, we can’t make any guarantees. It all depends on individual societies and may be affected by past publishing deals. The best way to increase your odds is to add as many titles as possible to your account with the correct co-writers, splits, and any related ISRC/recording information.
If we successfully collect your retroactive royalties, the payment will probably arrive two or three quarters after your first royalty statement.